I'm a bit put off by the wording of a certificate acceptance dialog
asking me to OK it.

The file storage and sharing website box.net has a feature that uses a
Java applet to allow you to drag-n-drop files from your finder onto
their window for upload to your box on their site. When the applet
loads you get a pretty standard-looking dialog asking you to trust a
certificate. I was ready to give it my OK except it says:

"Click Trust to run this applet and allow it unrestricted access to your
computer. Click Don't trust to run this applet with standard Java
restrictions."

That phrase "unrestricted access" is what scares me. I wouldn't give my
best friend unrestricted access to my computer, so I'm sure not gonna
give it to a commercial website that specializes in file sharing! So I
went with "don't trust" with standard Java restrictions, and the
drag-n-drop feature did not work.

1. What is "unrestricted access" in this context?
2. What are "standard Java restrictions"?